KR101080254B1 - Method for inputting handwriting using touchscreen and handwriting input device using the same - Google Patents

Abstract

The present invention stores the coordinate information of a stroke that a user writes on a touch screen, and determines whether the break of the writing stroke is the intention of the user or irrelevant to the user's intention during the quick writing process when the writing stroke is broken. If it is determined that the writing stroke is cut off regardless of the user's intention, the cut writing stroke is interpolated using the writing speed and the writing direction data of the same writing stroke, thereby enabling a more natural and high quality writing input.

Description

Method for inputting handwriting using touchscreen and handwriting input device using the same}

The present invention relates to a handwriting input method and apparatus, and more particularly, to a handwriting input method using a touch screen and a handwriting input method using the same.

With the development of technology, various electronic products are being developed to provide convenience for living. In particular, in order to meet the trend of miniaturization of electronic products in recent years, many electronic products are applying a touch screen.

By applying touch screens to electronic products, not only can users achieve miniaturization of products by removing buttons that are required for conventional users to control the functions of electronic products, but also the existing simple methods for inputting information. In addition to the menu selection input, there is an advantage that the input of a variety of information, such as the user's handwriting.

Types of touch screens include a pressure-sensitive touch screen that measures the position of an object by sensing the pressure applied to the touch screen, and a sensor installed at the corner to detect the position of the object by detecting a change in electric charge flowing on the surface of the touch screen. Capacitive touch screens are typical, and in addition, there are ultrasonic touch screens and optical imaging touch screens, and among these, pressure sensitive touch screens are most widely used.

However, in the case of the conventional touch screen, regardless of the user's intention in the process of performing the user's writing, the touch screen does not recognize the handwriting or the user quickly performs the writing. Occasionally, the writing stroke is broken because the object is separated from the surface of the touch screen.

For example, referring to FIG. 1, which illustrates an example of inputting handwriting using a conventional touch screen, a user inputs the word “ON” on the touch screen by handwriting. At this time, the user starts a stroke at 101 points. End of the stroke at 104 points to enter the alphabet "O". In this case, the alphabet "O" is composed of one stroke, but as shown, the interval between 102 and 103 that is not recognized by the touch screen because the object is separated from the surface of the touch screen or the writing pressure is insufficient in the writing process. ) May occur. This case often occurs when a user takes notes quickly.

As described above, the touch screen of the prior art not only exhibits poor handwriting input quality when the user quickly inputs handwriting, but also character recognition itself is impossible when character recognition is performed using the input handwriting. .

The present invention has been made in an effort to provide a handwriting input method using a touch screen and a handwriting input device using the same, capable of compensating handwritten strokes irrespective of a user's intention while performing handwriting, thereby enabling natural high quality handwriting input.

Handwriting input device with a touch screen of the present invention for solving the above problems, the position to output the coordinate information of the object the user touches the touch screen when the user inputs the writing on the touch screen using the object Measuring unit; A buffer unit which receives and stores the coordinate information sampled at a predetermined time period; And a compensator configured to generate coordinate information (compensation coordinate information) at a sampling time point at which the coordinate information is not stored using the coordinate information stored in the buffer unit and to store the coordinate information.

In addition, the compensator calculates a writing speed and a writing direction displacement in two immediately preceding time intervals when the coordinate information is not stored, using the coordinate information before the sampling time point where the coordinate information is not stored. The compensation coordinate information may be generated using the direction displacement.

In addition, the compensator calculates the writing speed and the writing direction displacement in two time intervals immediately after the time point at which the coordinate information is not stored, using the coordinate information after the sampling time point at which the coordinate information is not stored. The compensation coordinate information may be generated using the direction displacement.

In addition, the compensation unit examines a section (non-measured section) of sampling time points in which the coordinate information is not stored in the buffer unit, and views the points of the inside of the unmeasured section from the best point and the last point in the unmeasured section. Compensation coordinate information may be generated in order.

The compensator may be further configured to calculate a writing speed and a writing direction displacement in the section before the best traveling time point using coordinate information before the best traveling time point, and use the writing speed and the writing direction displacement to determine the Generating compensation coordinate information, calculating writing speed and writing direction displacement in a section immediately after the last writing time point immediately after the last writing time using the coordinate information after the last writing time point, and writing the writing speed and writing direction displacement. Using to generate the compensation coordinate information of the last point of time.

The compensator may generate compensation coordinate information by applying the calculated writing speed and the writing direction displacement to the viewpoints within the unmeasured interval.

The compensator calculates a writing speed and a writing direction displacement of the center viewpoint section by using compensation coordinate information of a viewpoint corresponding to the center viewpoint section of the unmeasured section, and calculates the writing speed and writing of the center viewpoint section. In the case where the direction displacement indicates an error more than a predetermined range in comparison with the writing speed and the writing direction displacement used to generate the compensation coordinate information, the calculated measurement speed and the writing direction displacement are adjusted according to the error, and thus the unmeasured. The compensation coordinate information of the section may be recalculated and stored in the buffer unit.

The compensator may generate compensation coordinate information by determining that the same writing stroke is cut off in the middle of the non-measuring section only when the number of samplings of the non-measuring section is less than or equal to a predetermined number.

The compensating unit may further include a writing stroke being terminated when the number of samplings of the sections (non-measured sections) at the sampling time points at which the coordinate information is not stored exceeds a predetermined number of times or the length of the unmeasured sections is greater than or equal to a predetermined distance. As a result, it is possible to generate additional compensation coordinate information of the finished writing stroke by using the writing speed and the writing direction displacement in the sections of the last sampling time points of the finished writing stroke.

On the other hand, in order to solve the above problems, the writing input method performed in the input device having a touch screen, (a) when the user inputs the writing on the touch screen using an object, the user makes contact with the touch screen Measuring coordinate information of the object; (b) sampling the coordinate information at predetermined sampling time periods and storing the coordinate information together with sampling time point information; (c) generating and storing coordinate information (compensation coordinate information) at a sampling time point at which coordinate information is not stored using the stored coordinate information; And (e) displaying the stored coordinate information to the user.

In addition, in the step (c), the writing speed and the writing direction displacement are calculated in two immediately preceding view points at the time point at which the coordinate information is not stored, using the coordinate information before the sampling time point at which the coordinate information is not stored. The compensation coordinate information may be generated using a speed and the writing direction displacement.

In addition, in the step (c), the writing speed and the writing direction displacement are calculated in two time points immediately after the time point at which the coordinate information is not stored, using the coordinate information after the sampling time point at which the coordinate information is not stored. The compensation coordinate information may be generated using a writing speed and the writing direction displacement.

In addition, the step (c) examines a section (unmeasured section) of sampling time points in which coordinate information is not stored, and starts at the innermost point of the unmeasured section from the best point and the last point in the unmeasured section. Compensation coordinate information may be generated in order.

In addition, in the step (c), the writing speed and the writing direction displacement in the two viewpoint sections immediately before the best traveling point are calculated using the coordinate information before the best traveling point, and the writing speed and the writing direction displacement are calculated. Generate the compensation coordinate information of the best-looking time point, calculate the writing speed and the writing direction displacement in two time points immediately after the last-looking time point using coordinate information after the last-looking time point, and calculate the writing speed and Compensation coordinate information of the last point in time may be generated using the writing direction displacement.

In addition, in step (c), compensation coordinate information may be generated by applying the calculated writing speed and the writing direction displacement to viewpoints within the non-measured section.

Also, in the step (c), the writing speed and the writing direction displacement of the center view section may be calculated using the compensation coordinate information of the view point corresponding to the center view section of the unmeasured section, and calculated for the center view section. If the writing speed and the writing direction displacement indicate an error more than a predetermined range compared to the writing speed and the writing direction displacement used for generating the compensation coordinate information, the calculated writing speed and writing direction displacement are adjusted according to the error. To recompute the compensation coordinate information of the unmeasured interval.

In addition, in the step (c), it is possible to generate compensation coordinate information by determining that the same writing stroke is cut off in the middle of the non-measuring section only when the number of samplings of the non-measuring section is less than or equal to a predetermined number.

In addition, in the step (c), when the number of samplings of the intervals (non-measured intervals) of the sampling time points at which the coordinate information is not stored exceeds a predetermined number of times or the length of the unmeasured intervals is greater than or equal to the predetermined distance, the writing stroke In response to determining that the information is ended, additional compensation coordinate information of the finished writing stroke may be generated using the writing speed and the writing direction displacement in the sections of the last sampling time points of the finished writing stroke.

The present invention stores the coordinate information of a stroke that a user writes on a touch screen, and determines whether the break of the writing stroke is the intention of the user or irrelevant to the user's intention during the quick writing process when the writing stroke is broken. If it is determined that the writing stroke is cut off regardless of the user's intention, the cut writing stroke is interpolated using the writing speed and the writing direction data of the same writing stroke, thereby enabling a more natural and high quality writing input.

As described above, the present invention identifies a case where a user intentionally distinguishes a handwriting stroke from a handwriting stroke input by the user, and a broken handwriting stroke generated in the writing process regardless of the user's intention in one handwriting stroke. Compensation for the disconnection in the latter case.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

2 is a view for explaining the concept of a handwriting input method according to a preferred embodiment of the present invention. Referring to FIG. 2, a method of inputting writing by compensating sections 102 to 103 in which writing strokes are missing in the example shown in FIG. 1 will be described.

When the user touches an object such as a hand, a pen, a stylus, etc. (hereinafter referred to as "object") on the touch screen, the present invention identifies coordinates where the object is in contact with the touch screen and generates coordinate information. The handwritten content is displayed at a position corresponding to the coordinate information.

In this case, the touch screen samples the coordinate information (when the horizontal axis is referred to as the x axis and the vertical axis as the y axis, the coordinate information is represented by (x, y)) at a predetermined time period (for example, 1/100 second), Coordinate information of a corresponding sampling time point is stored, and as shown in FIG. 2, coordinate information is connected to input and display handwriting information. Hereinafter, the sampling time interval in which the coordinate information is stored is used as the same meaning as the "measurement interval".

On the other hand, for a section in which writing is interrupted (that is, a section in which no coordinate information is generated, hereinafter referred to as an "unmeasured section"), information indicating that sampling time and coordinate information have not been generated (for example, the number 0 or (0) , 0) coordinates). In the example shown in FIG. 2, sampling time point information and coordinate information, which are sampled and stored, are shown in Table 1 below.

Viewpoint A B C D E F G H location (x _A , y _A ) (x _B , y _B ) (x _C , y _C ) (x _D , y _D ) (x _E , y _E ) (x _F , y _F ) (x _G , y _G ) (x _H , y _H )

I J K L M N P Q R 0 0 (x _K , y _K ) (x _L , y _L ) (x _M , y _M ) (x _N , y _N ) (x _P , y _P ) (x _Q , y _Q ) (x _R , y _R )

In the example described in Table 1, it can be seen that sections (H-I, I-J, J-K) in which writing is interrupted occur. In the latter case, the present invention determines whether the section in which the writing is cut off is actually cut by the user intentionally to separate the stroke or in the process of performing the writing quickly regardless of the user's intention. Perform stroke compensation.

The method of determining whether the writing stroke is a section to be compensated can be variously applied, and the preferred embodiment of the present invention is determined according to the number of sampling time points of the section where the writing is interrupted. For example, if the sampling time period is 1/100 second, in the example shown in Fig. 2, a new stroke is generated in 0.03 seconds, and it is the same stroke because it is virtually impossible for the user to intentionally separate and write strokes in 0.03 seconds. Since it is reasonable to judge, it is judged that the stroke is disconnected against the intention of the user. Therefore, the stroke is compensated for the broken stroke within the predefined sampling time number, and the broken stroke is further input and displayed as it is determined by the intentional stroke classification of the user.

Meanwhile, the method of compensating for the stroke will be described first. First, the writing speed of each sampling time point is calculated by connecting the coordinates of each sampling time point at which the coordinate information is input, and the sampling time point ("unmeasured time interval") where writing is interrupted. The speed of the unmeasured section is calculated using the writing speed of the immediately preceding section. In general, rapid deceleration or acceleration of the writing speed during a very short sampling time period does not actually occur, so it is not unreasonable to use the writing speed of the immediately preceding section.

Thereafter, the writing direction of the unmeasured section is calculated using the direction displacement of the section immediately before the unmeasured section. Referring to FIG. 3, the method of calculating the writing direction is first extended to a line segment connecting the coordinates of the FG section, which is a section before the two sections of the unmeasured section (HI section), and immediately before the unmeasured section (HI section). The direction displacement is measured by calculating the angle TH1 of the line segment connecting the coordinates of the section GH.

In a general writing process, such as when a user draws a straight line or draws a circle, the direction is often stroked constantly. Therefore, the user performs writing in an unmeasured section (HI section) so that the same displacement occurs as the GH section. Can be assumed.

Therefore, it is calculated that the same direction displacement as that generated in the GH section will occur in the non-measured section (HI section), so that the distance corresponding to the calculated writing speed is equal to the calculated direction at the extension line of the GH line at the coordinates of the H time point. The line is extended to generate coordinates (x _I , y _I ) corresponding to the extended line as compensation coordinates.

In addition, compensation coordinates may be generated in the same manner as in the HI section for the IJ section which is the unmeasured section. That is, the line segment is extended by the same distance (writing speed) as the HI section to have the same direction displacement as the HI section in the compensation coordinates of the sampling time I to determine the compensation coordinates at the sampling time J.

Thereafter, the compensation of the writing stroke is completed by connecting the compensation coordinate of the sampling time J and the coordinates of the sampling time K measured and stored in advance.

Meanwhile, in the example shown in FIG. 3, the compensation is sequentially performed from the sampling point I to the sampling point K direction. However, the compensation is performed at both ends of the non-measured section and compensated at the center of the unmeasured section. It is also possible to interconnect the coordinates.

Referring to FIG. 4, compensation of the HI and JK sections, which are both ends of the unmeasured section, is first performed to generate compensation coordinates of sampling points I and J, and the compensation coordinates of the points I and J are connected to each other. Complete the stroke reward.

The method of generating the compensation coordinates of the sampling time point I is the same as the example shown in FIG. 3, and the method of generating the compensation coordinates of the sampling time point J applies the same method as the method shown in FIG. 3.

Specifically, the line segment connecting the coordinates of the sampling points K and L is extended to measure the direction displacement angle TH2 with the line segment connecting the coordinates of the sampling points L and M. At this time, as in the example of FIG. 3, it is assumed that the same direction displacement TH2 is applied to the section KL from the unmeasured section JK and the writing is performed, while the extension line passes through the coordinate K and the line segment of the section KL and the TH2. The line segments forming the direction displacement angle are extended by the distance (writing speed) of the section KL in the direction of the sampling point J to generate the compensation coordinates of the sampling point J.

Thereafter, the compensation coordinates of the sampling points I and J are interconnected to complete the handwritten stroke compensation.

Meanwhile, in addition to the methods shown in FIGS. 3 and 4, a method of generating compensation coordinates may be variously applied. For example, in FIG. 3, compensation is performed in the K direction at the sampling time H, but the same as the example shown in FIG. 4. It will be appreciated by those skilled in the art that the compensation may be performed in the H direction at the sampling point K in such a manner.

In addition, in the above examples, for convenience of description, the writing speed and the direction displacement of the sampling point section immediately before or immediately after the non-measuring section are equally applied to the non-measuring section. It is to be noted that the writing speed and the direction displacement of the unmeasured section may be determined in consideration of the measurement and the direction displacement and the rate of change of the writing speed and the direction displacement.

On the other hand, if the compensation coordinates are generated by the above-described method, but the sampling number of the non-measured section is large, an error may occur and a compensated writing stroke may be inappropriate. For example, in the example shown in FIG. 5, the compensation coordinates of the sampling time point I were generated using the measurement intervals FG and GH, and the compensation coordinates of the sampling time point J were generated using the measurement intervals KL and JK. It can be seen that the writing speed (ie, distance) between I and J is significantly smaller than other sections.

Therefore, if the writing speed (distance) between these compensated coordinates is larger or smaller than the allowable error limit compared to other sections, the distance (writing speed) between each coordinate is corrected so that the distance between the corrected coordinates is the same. do. The correction method can be applied in various ways. In the simplest case, the correction coordinates are generated again by calculating the average of the distances of the compensated sampling intervals, and then repeating the generated correction coordinates until the above conditions are satisfied. .

In addition, as shown in the example of FIG. 6, after the correction is performed in the center direction at both ends of the unmeasured section, the direction displacement may suddenly change as a result of connecting the correction coordinates in the center.

In this case, as in the case where the writing speed changes abruptly, correction coordinates may be corrected by various methods. In the simplest example, the average of the directional displacements of the compensation interval is calculated, thus regenerating the correction coordinates and repeating until the generated correction coordinates satisfy the above condition.

7 is a conceptual block diagram illustrating a configuration of a handwriting input device using a touch screen according to an exemplary embodiment of the present invention. Referring to FIG. 7, the handwriting input device of the present invention conceptually includes a position measuring unit 710, a buffer unit 720, a compensator 730, a handwriting input unit 740, and a display unit 750. 730 includes a writing speed calculator 732, a direction displacement calculator 736, and a compensation controller 734, and in actual implementation, may be implemented through each or a combination of the conceptual block diagrams.

First, the position measuring unit 710 measures the position on the touch screen in contact with the object when the user touches the touch screen and outputs coordinate information to the buffer unit 720.

The buffer unit 720 samples the coordinate information input from the position measuring unit 710 at a predetermined time period, and stores each sampling time point information and coordinate information as described in Table 1 below. In addition, the compensation coordinates generated by the compensation unit 730 receives and stores. The buffer unit 720 may be implemented through various storage media such as a shift register that stores only data in a predetermined size.

The writing speed calculation unit 732 of the compensator 730, as in the example shown in FIG. 3, immediately before the point in time H and the second point in time (G) where the coordinate information is not stored in the unmeasured section (G). Calculate the writing speed by linking the coordinates of) to calculate the distance.

The direction displacement calculator 736 of the compensator 730 calculates the direction displacement of the immediately preceding section of the unmeasured section as shown in FIG. 4.

The compensation controller 734 examines the section where the writing stroke is cut by examining the coordinate information stored in the buffer 720, and when the sampling frequency of the section is less than or equal to a predefined number, the writing speed calculating unit 732 and the direction The displacement calculation unit 736 is controlled to receive the writing speed and the direction displacement, and generates compensation coordinates by using the same, and stores the compensation coordinates in the buffer unit 720.

The handwriting input unit 740 provides sampling time information and coordinate information stored in the buffer unit 720 as an input value to an application program of an electronic device in which the handwriting input device of the present invention is installed, such as its own firmware or a computer, a mobile phone, or a PDA.

The display unit 750 displays the coordinate information input from the handwriting input unit 740 to the user.

8 is a flowchart illustrating a handwriting input method according to a preferred embodiment of the present invention. Referring to FIG. 8, when a user touches an object on the touch screen while writing, the position measuring unit 710 outputs the coordinate information of the object contact to the buffer unit 720, and the buffer unit 720. Samples the coordinate information at a constant sampling time period and stores the sampling time point and the coordinate information (S810).

Meanwhile, the compensation controller 734 of the compensation unit 730 examines the data stored in the buffer 720 to determine whether there is a section where the stroke is cut (S820). The method for identifying the section in which the stroke is cut is variously applicable, and a preferred embodiment of the present invention is determined according to the sampling frequency of the section in which the stroke is cut, as described above.

On the other hand, if it is determined that a single stroke is cut off and needs to be compensated, first, the writing speed calculation unit 732 calculates the writing speed (S830). The method of calculating the writing speed may also be calculated in various ways, but in the preferred embodiment of the present invention, as described above with reference to FIG. 3, the writing speed of the viewpoint section immediately before the best sampling point interval to generate the compensation coordinates ( Distance as the writing speed of the entire compensation section, or as described with reference to FIG. 4, or using the writing speed of the measurement section immediately before the best viewing point on both sides of the unmeasured section, The writing speed may be calculated by using the writing speed of the measurement section immediately after the most recent time point.

Thereafter, the direction displacement of the unmeasured section is calculated (S840). The method of calculating the direction displacement in each non-measured section is variously applicable, and the method of measuring the direction displacement according to a preferred embodiment of the present invention has been described in detail with reference to FIG. 3 or 4, and thus, a detailed description thereof will be omitted. .

 On the other hand, when the writing speed and the direction displacement of the unmeasured section are calculated, as described with reference to FIGS. 3 and 4, the compensation coordinates of the unmeasured sampling time point are generated using the writing speed and the direction displacement (S850).

Thereafter, the above-described steps S830 to S850 are repeated until the compensation coordinates are generated at all unmeasured sampling time points (S860).

After the compensation coordinates are generated for all unmeasured sampling time points, the compensation control unit 734 checks whether corrections to the compensation coordinates are necessary, as shown in FIGS. 5 and 6 (S870), and the corrections are required. In the case of performing correction on the compensation coordinates, the process proceeds to step S870 again until the correction is not necessary, that is, the correction process is repeatedly performed until all the compensation coordinates satisfy the preset condition (S880).

When the generation of the compensation coordinates is completed, the generated compensation coordinates are stored in the buffer unit 720, and the coordinate information stored in the buffer unit 720 is output to the handwriting input unit 740 and output as input values to other applications. The handwriting is output to the display unit 750 and displayed to the user (S890).

So far, the handwriting input method and the handwriting input device using the touch screen according to the preferred embodiment of the present invention have been described.

A feature of the present invention lies in a method of compensating for a broken handwritten stroke when one handwritten stroke is cut off irrespective of the user's intention. In the above-described example, the section in which the handwritten stroke is cut off is provided for convenience of explanation. Although input values are provided to other applications and displayed to the user, it will be understood that various modifications are possible within the technical spirit of the present invention.

9, the coordinates measured by the position measuring unit 910 are displayed on the display unit 950 in real time, and are provided as input values of other applications through the writing input unit 940. On the other hand, the buffer unit 920 samples the coordinate information at a predetermined time period and stores it as described above, and the compensation unit 930 compensates for the broken stroke by using the information stored in the buffer unit 920, and when the compensation is completed The compensated handwriting stroke information is output to the display unit 950 and the handwriting input unit 940, respectively, and the compensated handwriting stroke is displayed to the user, and the compensated handwriting input information may be input to the application program.

Meanwhile, the present invention may be applied to a case in which the stroke is additionally compensated for beautifully displaying the writing stroke at the end point of the writing, in addition to compensating a section interrupted in the middle of the writing stroke against the user's intention.

For example, in the example shown in FIG. 1, when the user inputs writing only to the point indicated by reference numeral 105 in the process of writing "ON", the writing input device of the present invention calculates the existing writing speed and direction displacement. As a result, the handwritten stroke can be input by compensating and displaying the handwritten stroke as indicated by the dotted line up to the position 106.

Referring to FIGS. 7 and 9 again, the handwriting input device of the present invention compensates a section in which the handwriting stroke is cut in the same manner as described above, while the compensation units 730 and 930 are coordinate information stored in the buffers 720 and 920. If the sampling frequency of the section where the stroke is cut (unmeasured section) is less than or equal to the predefined number of times using the symbol, it is determined that one writing stroke is cut in the middle to compensate for the section that has been cut as described above, and the sampling of the section that has not been measured. If the number of times exceeds the predefined number of times, or if the distance of the unmeasured interval is longer than the predefined distance, it is determined that one handwriting stroke is finished and that additional handwriting strokes are generated.

In addition, when the writing stroke is completed, the compensation units 730 and 930 examine the writing speed of the sampling point section immediately before the writing is finished, and determine that the additional writing stroke is generated only when the writing speed is higher than or equal to a predefined speed. Can be. The reason is that it is contrary to the intention of the user to generate additional handwritten strokes even if the user slows down at the end point of the handwritten stroke so as not to intentionally generate more handwritten strokes.

After determining to generate additional writing strokes, the buffer unit 720 or 920 generates compensation coordinates by a predetermined number of sampling times using the writing speed and the direction displacement of the sampling section immediately before the writing stroke ends, calculated in the same manner as described above. ) And the compensated writing section is output to the display units 750 and 950 and the writing input units 740 and 940 to extend the writing section.

The present invention can also be embodied as computer-readable codes on a computer-readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like, which are also implemented in the form of a carrier wave (for example, transmission over the Internet). It also includes. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

1 is a diagram illustrating an example of inputting writing using a conventional touch screen.

2 is a view for explaining the concept of a handwriting input method according to a preferred embodiment of the present invention.

3 to 6 are diagrams illustrating a process of compensating for a broken writing stroke according to a preferred embodiment of the present invention.

7 is a block diagram illustrating a configuration of a writing input device using a touch screen according to an exemplary embodiment of the present invention.

8 is a flowchart illustrating a handwriting input method according to a preferred embodiment of the present invention.

9 is a block diagram illustrating a configuration of a handwriting input device according to a modified embodiment of the present invention.

Claims (18)

A handwriting input device with a touch screen, A position measuring unit for outputting coordinate information of an object touched by the user when the user inputs writing on the touch screen using an object; A buffer unit which receives and stores the coordinate information sampled at a predetermined time period; And Using the coordinate information stored in the buffer unit, the writing speed and the writing direction displacement are calculated in the unmeasured section in which no coordinate information is stored, and using the writing speed and the writing direction displacement in the non-measuring section, the unmeasuring section And a compensator for generating coordinate information (compensation coordinate information) at a sampling time of and storing the coordinate information in the buffer unit. The method of claim 1, The compensator calculates the writing speed and the writing direction displacement in a predefined number of time intervals immediately before the sampling time point at which the coordinate information is not stored, using the coordinate information before the sampling time point at which the coordinate information is not stored, And the compensation coordinate information is generated by using a velocity and the displacement in the writing direction. The method of claim 1, The compensator calculates the writing speed and the writing direction displacement in a predefined number of time intervals immediately after the sampling time point when the coordinate information is not stored, using the coordinate information after the sampling time point when the coordinate information is not stored, And the compensation coordinate information is generated by using a velocity and the displacement in the writing direction. The method of claim 1, The compensator examines a section (non-measured section) of sampling time points at which the coordinate information is not stored in the buffer unit, and in the order of the inner points of the unmeasured section from the best time point and the last point in the unmeasured section. And a handwriting input device for generating compensation coordinate information. The method of claim 4, wherein the compensation unit Calculate the writing speed and the writing direction displacement in the section before the best traveling point using the coordinate information before the best starting point, and generate the compensation coordinate information of the best starting point using the writing speed and the writing direction displacement. and, The writing speed and the writing direction displacement are calculated in the section immediately after the last writing time point immediately after the last writing time using the coordinate information after the last writing time point, and the last writing time using the writing speed and the writing direction displacement. Handwriting input device characterized in that for generating the compensation coordinate information of. The method of claim 5, wherein the compensation unit And the compensation coordinate information is generated by applying the calculated writing speed and the writing direction displacement to the viewpoints within the non-measured section. The method of claim 6, wherein the compensation unit The writing speed and the writing direction displacement of the center viewpoint section are calculated using the compensation coordinate information of the viewpoint corresponding to the center viewpoint section of the unmeasured section, and the writing speed and the writing direction displacement calculated for the center viewpoint section are compensated for. When the error is more than a predetermined range compared to the writing speed and the writing direction displacement used to generate coordinate information, the calculated writing speed and the writing direction displacement are adjusted according to the error to compensate the coordinate information of the unmeasured section. Handwriting input device characterized in that for recalculating and storing in the buffer. The method of claim 4, wherein the compensation unit And writing compensation coordinate information by determining that the same writing stroke is cut off in the middle of the non-measuring section only when the number of samplings of the non-measuring section is less than or equal to a predetermined number. The method of claim 1, wherein the compensation unit When the number of samplings of the sections (unmeasured sections) of the sampling time points at which the coordinate information is not stored exceeds a predetermined number of times or the length of the unmeasured sections is greater than or equal to the predetermined distance, it is determined that the writing stroke is ended, and thus And additional compensation coordinate information of the finished writing stroke by using the writing speed and the writing direction displacement in the sections of the last sampling points of the writing stroke. A handwriting input method performed in an input device having a touch screen, (a) measuring, by the user, writing information on the touch screen using an object, measuring coordinate information of an object that the user touches on the touch screen; (b) sampling the coordinate information at predetermined sampling time periods and storing the coordinate information together with sampling time point information; (c) calculating the writing speed and the writing direction displacement in the unmeasured section in which no coordinate information is stored using the stored coordinate information, and using the writing speed and the writing direction displacement in the non-measuring section, Generating and storing coordinate information (compensation coordinate information) at a sampling point of time; And (e) displaying the stored coordinate information to a user. The method of claim 10, wherein step (c) comprises: Calculates a writing speed and a writing direction displacement in a predefined number of time intervals immediately before the sampling time point where the coordinate information is not stored, using the coordinate information before the sampling time point when the coordinate information is not stored, And generating the compensation coordinate information by using a writing direction displacement. The method of claim 10, wherein step (c) Calculates the writing speed and the writing direction displacement in a predefined number of time intervals immediately after the sampling time point at which the coordinate information is not stored, using the coordinate information after the sampling time point at which the coordinate information is not stored. And generating the compensation coordinate information by using a writing direction displacement. The method of claim 10, wherein step (c) Investigating the section (unmeasured section) of sampling points in which the coordinate information is not stored, and generating compensation coordinate information in the order of the points in the unmeasured section from the best point and the last point in the unmeasured section. Handwriting input method characterized by the above-mentioned. The method of claim 13, wherein step (c) The writing speed and the writing direction displacement are calculated in the two viewpoint sections immediately before the best traveling time point using the coordinate information before the best traveling time point, and the compensation coordinates of the best traveling time point using the writing speed and the writing direction displacement. Generate information, The writing speed and the writing direction displacement are calculated in the two view sections immediately after the last starting point using the coordinate information after the last starting point, and the compensation coordinate of the last starting point using the writing speed and the writing direction displacement. Handwriting input method characterized in that for generating information. 15. The method of claim 14, wherein step (c) And the compensation coordinate information is generated by applying the calculated writing speed and the writing direction displacement to the viewpoints within the non-measured interval. The method of claim 15, wherein step (c) The writing speed and the writing direction displacement of the center viewpoint section are calculated using the compensation coordinate information of the viewpoint corresponding to the center viewpoint section of the unmeasured section, and the writing speed and the writing direction displacement calculated for the center viewpoint section are compensated for. When the error is more than a predetermined range compared to the writing speed and the writing direction displacement used to generate coordinate information, the calculated writing speed and the writing direction displacement are adjusted according to the error to compensate the coordinate information of the unmeasured section. Handwriting input method, characterized in that for recalculating and storing. 17. The method according to any one of claims 13 to 16, wherein step (c) And determining compensation coordinate information by determining that the same writing stroke is interrupted in the non-measuring section only when the number of samplings of the non-measuring section is less than or equal to a predetermined number. 17. The method according to any one of claims 10 to 16, wherein step (c) When the number of samplings of the sections (unmeasured sections) of the sampling time points at which the coordinate information is not stored exceeds a predetermined number of times or the length of the unmeasured sections is greater than or equal to the predetermined distance, it is determined that the writing stroke is ended, and thus And generating additional compensation coordinate information of the finished writing stroke by using the writing speed and the writing direction displacement in the sections of the last sampling points of the writing stroke.

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